Cisco 2960-X Discover SFP Modules Without Rebooting



In the world of IT networking, Cisco switches are renowned for their reliability and performance. The Cisco 2960-X is a popular model for small and medium businesses, offering a range of features and performance for a reasonable price. One issue with the 2960-X is that it is not always easy to discover the type of Small Form-Factor Pluggable (SFP) modules that are installed. This can be a problem if you need to replace an SFP module, as you will not know whether the replacement module is compatible.

Fortunately, there is a way to discover the type of SFP module installed without rebooting the switch. This can be done by enabling the Cisco Discovery Protocol (CDP) on the switch. CDP is a Layer 2 protocol that is used to discover information about neighboring Cisco devices. It can be used to discover the type of SFP module installed on the switch, as well as other information such as the interface type, port number, and so on.

To enable CDP on the 2960-X, use the following command: enable cdp. This will enable CDP on all interfaces on the switch. Once CDP is enabled, the switch will start sending out CDP packets to neighboring devices, and you can view the information it has discovered by running the show cdp neighbors command.

The output of this command will list all of the devices that the switch has discovered and the type of SFP module installed on each port. This is useful for determining which SFP module is installed and whether it is compatible with the switch. For example, if the switch has discovered a Cisco SFP-10G-SR module on a particular port, then you know that the port is compatible with a 10Gbps SFP module.

It is important to note that CDP is only available on the 2960-X and not on other models of Cisco switches. It is also important to remember that running the show cdp neighbors command does not actually enable CDP, only displays the information that has been discovered by the switch.

In summary, it is possible to discover the type of SFP module installed on a Cisco 2960-X switch without rebooting the switch by enabling the Cisco Discovery Protocol (CDP). This is done by using the enable cdp command, which will enable CDP on all interfaces on the switch. Once CDP is enabled, the switch will start sending out CDP packets to neighboring devices, and you can view the information it has discovered by running the show cdp neighbors command. This can be used to determine which SFP module is installed and whether it is compatible with the switch.

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